Aetiology

The aetiology of skin diseases is quite complex, with multiple factors potentially playing a role. The primary factor is genetics, as some skin diseases can be hereditary, while environmental factors such as exposure to UV radiation and lifestyles such as smoking can also be important. In some cases, traumatic injuries can also contribute to the development of skin disease. Genetically determined disorders of the skin may be caused by a single gene mutation or a combination of mutations. Such a genetic mutation may influence the structure and/or function of the affected proteins, leading to pathology. The skin's natural barrier can also be disturbed by numerous environmental factors, such as overheating, extreme cold, UV radiation, topical and/or inhaled chemicals, and ill-fitting clothing. These environmental factors, in combination with genetic predisposition, can lead to skin diseases. Polymorphic light eruption is an example of an environmental skin disease caused by multiple genes and UV radiation. Exposure to UV radiation can produce a histamine reaction in individuals with genetic predisposition, resulting in an itchy skin rash. Traumatic injuries to the skin can result from physical, heat, or chemical agents. The most common traumatic injury is cutaneous pressure injury, which is common in patients who are bedridden, experiencing multiple surgical procedures, and/or have skin pulled tight over a bony protrusion. Other external injuries may cause infection, a condition commonly referred to as impetigo. The aetiology of skin diseases is extremely complex and varied. Genetically determined diseases, environmental factors, and traumatic injuries can all lead to skin problems, ranging from simple rashes to more serious and permanent damage. It is therefore important for patients to be aware of the potential sources of their skin diseases, and to take preventive measures when feasible.